<html>

<head>
    <style>
        #div1 {
            width: 960px;
            height: 30px;
        }

        #div1 ul li {
            float: left;
            width: 60px;
            height: 30px;
            border-right: 1px solid;
        }
    </style>

</head>

<body>
    <div id='div1'>
        <ul>
            <li>muli1</li>
            <li>muli1</li>
            <li>muli1</li>
            <li>muli1</li>
        </ul>
    </div>

</body>

</html>